I think the answer will depend on your growth in understanding and appreciating the virtue of forgiveness. Have you so lived with forgiveness that you see it as vital within yourself? Is forgiveness now part of who you are as a person? Do you now think that you have a certain obligation to forgive others, not a grim obligation, but a joyous one?
If you answer yes to these questions, then I think you likely have within yourself an obligation to share what you know with others—-without force or condemnation toward those who are not ready for your message. As you started with forgiveness being a choice for you, it is a choice for others. Please see that and let people have their own free will as you make known what you see as the beauty of forgiving.